I heard this from a friend who owns the game: it's a Powered By the Apocalypse styled game, with all the good and bad that entails. (Narrative focused and not a detailed simulation, no particular turn order, characters encouraged to fit into a specific mold so that if you're playing a Firebender, you're probably playing someone a lot like Zuko.) The owner felt like it added needless complexity to the basic PbtA formula, similar to "Masks: a New Generation" in which you're angsty teenage superheroes whose stats are about self-perception: "Mundane, Superior, Freak" and so on. Also noteworthy is that you do not play as the Avatar, probably a good idea.
Free RPG Day is coming up in late June, so I might get to try this game then.